Author: jeroenottens

Time for a post on a quick model I have finished some time ago, but didn’t get around to post about. It is the Spinner of the movie Bladerunner.

In fly modus

The model is motorized with three functions:
– Opening left door
– Opening right door
– Switching between fly modus and drive modus

The last function is actually a bit more intricated. It consists of the following movements:
– First the covers around the front wheels move outwards
– Then the covers rotate 90 degrees
– And at the same time the front wheels come down

After nearly 10 months
of hard work I am finally able to present the LEGO Technic replica of
the Liebherr LTM11200 crane. It is one of the biggest roadworthy
cranes in the world and I have tried to do it justice in LEGO as
well.

This is actually a
redesign of the model I made in 2013. At that time I had designed the
carrier, the superstructure and the outer section of the boom. I have
gone through the entire design, updated it to improve on the weak
points of the original design and updated it to the newer parts that
are now available. I also designed the complete boom from the ground
up.

When I started this
model I wanted to make it the most complex remote controlled model
that I could think of. At the same time I didn’t want to exceed the
limitations that the LEGO PF system set. Which meant no more than 8
motors could be used in the model.

They are equally
divided between the carrier and the superstructure. In the carrier
one motor is used for switching, whereas the other three are used to
drive different functions depending on the position of that switch.
It has two positions. In position 1 the three motors are used for
driving, steering and switching the steeringmode (you can steer
normally, or you can crabsteer). In position 2 the three motors are
used to expand the outriggers, elongate the outriggers and finally
extend the outrigger feet.

In the superstructure a
similar setup is used, only this time there are four positions for
the switch. Which gives 12 different functions that can be remotely
controlled. Of these 12 functions 8 are located in the superstructure
itself:

Rotating the
superstructure *

Raising/lowering
the counterweight

Raising/lowering
the hook

Raising/lowering
the boom via the cylinders

Raising/lowering
the boom via the rope-and-pulley system

Raising/lowering
the arm of the operator cabin

Rotating the arm
of the operator cabin

Tilting the
operator cabin

And 4 functions are
routed onto the boom:

Extending the 4
section boom *

Spreading the
stabilizer arms

Tilting the
stabilizer arms *

Raising/lowering
the supporting legs (needed in case the boom has to be transported
separately from the rest of the crane)

This model was always
intended to push the edge of the possibilities with LEGO Technic. And
unfortunately that edge pushed back. The model is incredibly complex
(as an example: it uses over 300 gears) and doing all that in plastic
proved to be too difficult for some functions. The functions with an
asterisk require manual assistance when operating. And believe me,
even though lifting the boom is possible by combining the cylinders
and the rope-pulley system, it is really scary to see how much force
is going through all that plastic.

Nevertheless, I feel that this model does not meet my quality standards. I therefor decided that I will offer instructions at 50% of the intended price, which means you can buy the instructions for 37.50 euros instead of 75 euros. You will be able to pay full price for the instructions if you want to encourage me to keep pushing the Technic boundaries with my upcoming models.

A big thank has to go
to Merlijn Wissink who spend a huge amount of time on making the
instructions. The instructions are done to LEGO standards and fill a
book of 1174 pages. We did our best to make sure that every step is
clear, but as you can imagine I might have missed something. Please
let me know if there is anything unclear and I’ll try to explain what
was intended.

The partslist on
Rebrickable was also compiled with the utmost care, but also here
errors could have been made by me. If you find out there is a piece
missing (or too much), please let me know and I will update the list.

I hope you enjoy
building and playing with this model as much as I did designing it.
The end result is a nearly one meter long mammoth that can reach up
to 2.5 m high. It is by far not the biggest crane made out of LEGO
Technic, but it sure is one of the most complex.

It has been quiet on this blog for quite some time. However that didn’t mean not much was going on. In fact a whole array of exciting models are going to appear in the coming weeks. They all happened to be ready around the same time.

I will kick off with my LEGO Technic version of the Millennium Falcon:

Millennium Falcon

Since it is a LEGO Technic model it has a few working features. First of all the top gun turret is fully articulated. By turning the controls you can rotate the gun 360 degrees in the horizontal plane, but independently it can also rotate from horizontal to vertical. This gives a full hemisphere coverage above the ship.

The landing ramp is also remotely operated. By turning the control on top of the corridor to the cockpit the ramp lowers and closes.

The radar dish can be adjusted as well, but has no special controls.

Millennium Falcon rear

This model was made as a commission without an exclusivity clause. I therefore made instructions for a slightly adjusted version (with fewer rare parts, but with the same functionality). Instructions can be bought in my webshop.

Time for another update on my Liebherr crane. I have made a first version of the 4 stage boom. The thing is massive! It weighs over 4 kg, it has 90 long panels (3×11 curved, 3×11 flat, 5×11 flat) in it and it reaches 2.5 m when fully extended.

This is the fully extended position

Due to the weight it is now impossible to lift the boom with just the cilinders. So I added a system with rope and pullies to lift the boom. There is some fearsome bending of axles in the current setup when the boom is lifted, but it works.

I devised a new way of extending the boom to maximize the size of the inner sections, but also this system is struggling with the sheer weight of it all.

Rotating the superstructure has also become impossible with out a helping hand.

On the plus side, the whole crane can stand on it’s own when fully extended, which is an awesome sight. Also the speed of the ropes is not as slow as I feared.

Even though it looks finished, it is not. There are still quite some things to improve:

The rope for lifting the boom and the extention of the cilinders need to go to the same group of RC operations (if you remember there are 4 sets of 3 functions each in the superstructure).

A driving mechanism for extending the inner sections needs to be made that is strong enough (at least it is self braking now)

The structure where the pulleys in the rear are connected to needs to be strengthened (there are even some form-locked constructions that are being pried apart)

The stabilizer arms need to lift further upwards

The small LA’s in the stabilizer arms need to be replaced with big LA’s (that will bring the total amount of big LA’s in this model to 12)

The rope for the hook needs to be properly guided along the boom

The legs to put the boom on when moving the boom from the carrier to a transport wagon need to be designed and added

Here is the heavy road configuration version (without the extra pulleys to lift the boom):

This is the road configuration

Finally I am pleased to announce that the work on instructions has started. So please stay tuned.

This car has been a childhood memory for me. I remember seeing it for the first time and I was blown away by it. It is really special that I have had the chance to make one in LEGO. As usual I have tried to add as many authentic features as possible:

Here is the second post about my current project (or more accurately one of my current projects), the full RC Liebherr LTM11200 crane. It is the superstructure:

Liebherr LTM11200 Superstructure

This superstructure is packed with functions, 13 in total. All are RC, but only 4 motors are used. Combined with the 4 motors of the carrier this gives a total of 8 motors for the entire vehicle. And that is exactly the number of motors that can be individually controlled with the LEGO Power functions system.

In the center of the structure a big gearbox is used to switch between 4 groups of 3 functions each. Just as in the carrier each function is colourcoded in either red, yellow or black. Red is coupled to the XL motor and is used for the heavy jobs, like lifting the boom and rotating the superstructure, whereas yellow and black are coupled to L-motors. The switching is done with a M-motor.

The grouping is as follows:

Group 1

Yellow: Rotating the arm of the cabin

Black: Raising and lowering the cabin

Red: Tilting the cabin

Group 2

Yellow: Winch 1

Black: Winch 2

Red: Boom function 1 (which will be extending the boom. This way it is possible to extend the boom and wind down the winches at the same time)

Group 3

Yellow: Boom function 2

Black: Boom function 3

Red: Rotate the superstructure

Group 4

Yellow: Boom function 4

Black: Raising and lowering the counterweight

Red: Raising and lowering the boom

The superstructure also has one manual function, namely opening the cabin with a slidedoor.

As with the carrier a lot of attention has gone into the structural integrity of the build. The whole structure is formlocked where possible and longitudual beams are running along the bottom and topside to guide the forces towards the mounting with the carrier. As you can see in the video I used a brickbuilt rollerbearing for maximum support of the superstructure.

I made a short video to showcase all the functions:

And here is a final shot of the superstructure mounted onto the carrier in limited weight transportmode:

Here is another work in progress project that I have been working on for some time now. It is 1:8 scale supercar. This project is a cooperation with Marco van Overbeeke.

Marco is a talented freelance automotive designer who has earned his stripes in the hypercar market. Recent projects are the Dendrobium electric hypercar (exterior and interior together with his brother Andries van Overbeeke) which debuted at Geneva 2017, and the livery design of the Lunar Red exterior of the 2019 Aston Martin Valkyrie for Kris Singh. You can find more of Marco’s work on his website and instagram.

Here is a first bodywork sketch he made for me:

Exterior sketch Silvestros

At this moment I am perfecting the chassis. I have redesigned the chassis three times from the ground up. Reason for that is that there is quite a complex mechanism inside. This car will namely feature 4 wheel steering that is dependent on the gear it is in.

When you are in first gear the front and rear wheels steer in opposite direction. When you are in fourth gear the front and rear wheels steer in the same direction. And when you are in second or third gear the behaviour is something inbetween. When you are in reverse only the front wheels steer. This whole behaviour is controlled with linkages. connected to both the steering wheel and the sequential gearbox (with working paddle shifters next to the steeringwheel).

This time I don’t have a finished model to show, but instead I decided to show a bit more about the building process of a new model. I wasn’t actually planning to make this model this year, but as the Dutch say: The blood crawls where it can’t flow. Every now and then a model gets stuck in my head and I just need to build it. And this model got stuck about a month ago…

In this case it is a redesign of a model that I designed and abandoned a couple of years ago. Here you can see one of the few photos I made of it, to get a sense of what the final model will look like:

It is a fully remote-controlled model with 20 functions, 7 in the carrier, 9 in the superstructure and 4 in the boom (driven from the carrier). It is a model that is close to, if not over, the edge of what is possible with LEGO.

In this post I will concentrate on the carrier. Compared to the original model I have made a couple of changes:
Most noticeable is the colour scheme, which is changed to a white-orange livery (since yellow is not as abundantly available as it used to be).
But inside a lot more has changed. I have swapped two M-motors to L-motors (which weren’t available at the time). I have redesigned the outriggers (and I will have to do that again since they are not working to my liking), the function-switcher (to use the modern 3L driving rings), I colour coded the functions (for ease of operation) and I made all kind of small changes to ease the building process (if there is enough interest I might make building instructions).

In this video you can see how the carrier looks and works now:

As you can see retracting the outriggers still requires some redesigning to make them go in more smoothly. Switching the steeringmodes is also not a foolproof system (and I don’t know if it ever will be). The mechanism relies on moving a central axle with gears between two positions two studs apart. There is a mechanism in place that ensures that it is only possible to switch between modes when the wheels are straight. However, this mechanism is located quite far to the front (between the 2nd and 3rd wheel pair). Because of the torsional (lack of) stiffness in the long axle the last wheel pair can be one teeth off during the switch. So after a few switches the alignment between the different wheel pairs can get lost.
Another issue are the two driven wheels. When in normal steeringmode the steering angle of these wheels are only determined by some elastic bands. So sometimes they start to wiggle about. When in crab steering mode only one steeringrack is engaged, whereas the other is moved through a linkage with quite some play. As a result these wheels also don’t steer very well when in crab steering mode.

So, still some work ahead of me… If I have found some solutions I will post them here again.